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– 13 –

Procedure :
1. Mode : Record

 DECK B

set

MD IN
1) 315 Hz
2) 10 kHz

blank tape
CS-123

600 

Ω

attenuator

AF OSC

38.8 mV (–26 dB)

2. Mode : Playback

3. Confirm playback the signal recorded in step 1 become adjust-

ment level as follows.

4. If these levels do not adjustment level, adjustment the RV341

(L-CH) and RV441 (R-CH) to repeat step 1 and 4.

Adjustment level :
Playback output of 315 Hz to playback output of 10 kHz : –0.5 dB
to 0.5 dB. (–1.3 to 1.3 mV)

Adjustment Location : AUDIO board

Procedure :
1.  Mode : Record

 DECK B

2. Mode : Playback

3. Confirm playback the signal recorded in step become adjust-

ment level as follows.

4. If these levels do not adjustment level, adjust the RV401 (L-

CH) and RV451 (R-CH) to repeat step 1 and 4.

Adjustment Level :
OUTPUT level : –26 dB ± 0.5 dB (36.7 to 41.1 mV)

Adjustment Location : MAIN board

[AUDIO BOARD] – Conductor side –

set

+
–

recorded
portion

MD OUT

level meter

set

MD IN
315 Hz, 38.8 mV (–26 dB)

blank tape
CS-123

600 

Ω

attenuator

AF OSC

set

+
–

recorded
portion

MD OUT

level meter

RV301: Playback Level (Deck B L-CH)

RV401: Playback Level

(Deck B R-CH)

RV651:Tape Speed

(Normal)

RV652: Tape speed

(HIGH)

RV311: Playback Level

(Deck A L-CH)

RV411: Playback Level

(Deck A R-CH)

RV341: Record Bias (L-CH)

RV441: Record Bias (R-CH)

[MAIN BOARD]  – Component side –

RV401:
Record Level (L-CH)

RV451:
Record Level (R-CH)

– 14 –

Procedure :
1. Tune the set to 98 MHz
2. Adjust RV42 so that the TUNED indicatior goes on.

Adjustment Location : TCB board (see page 15)

Band : SW

Procedure :
1. Connect digital Voltmeter to diode D1 center lead and ground.
2. Adjust for a following value reading on digital Voltmeter.

SW

5.95 MHz

T2

1.2 Vdc

17.9 MHz

CV2

8.5 Vdc

Adjustment Location : TCB board (see page 15)

Band : SW

Procedure :
Adjust for maximum reading on level meter.

SW

7 MHz

T1

17 MHz

CV1

•

Repeat the procedures is each adjustment several times, and the
frequency coverage and tracking adjustment should be finally done
by the trimmer capacitors.

Adjustment Location : TCB board (see page 15)

set

AM RF signal
generator

Modulation: 400 Hz
30% modulation

+
–

level meter

SPEAKER terminal

AM ANTENNA terminal

: The adjustment should be performed in the publication.

(MW 

→

 FM 

→

 SW)

: As a front-end (FE1) is difficult to repair if faulty, re-

place it with new one.

•

Abbreviation

E2

: Tuner sections SW BAND do not exist.

E3

: Turner sections SW BAND exist.

EA : Saudi Arabia
MY : Malaysia
SP

: Singapore

HK : Hong Kong

Setting :
Band : MW

Procedure :
1. Set loop antenna A so that the loop antenna B input level be-

comes 55 dBµ/m (0.56 mV/m)

2. Tune the set to 999 kHz (at 9 kHz step) or 1,050 kHz (at 10 kHz

step).

3. Adjust RV41 so that the TUNED indicatior goes on.

Adjustment Location : TCB board (see page 15)

Always make the tuning level adjustment first.
(Since it affects the FM tuning level).

Setting :
Band : FM

AM RF signal
generator

loop antenna A

set

loop antenna B

Carrier frequency

Modulation

: 999 kHz (at 9 kHz step) or
  1,050 kHz (at 10 kHz step)
: 400 Hz 30 % modulation

set

FM ANTENNA terminal (TM1)

FM RF stereo signal
generator

Carrier frequency : 98 MHz
Modulation

: 1 kHz, 75 kHz (100%)

Output level

: 0.018 mV (25 dB 

µ

)

75 

Ω

 coaxial

– 15 –

[TCB BOARD] – Component side –

1. CD Block basically constructed to operate without adjustment.

Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10M

Ω

 impedance.

4. Clean an object lens by an applicatior with neutral detergent

when the signal level is low than specified value with the fol-
lowing checks.

This adjustment is to be done when the optical block is replaced.

1. Connect oscilloscope to test point TP (VC) and TP (RF) on BD

board.

2. Ground main board IC101 (pin (£) with the lead wire.
3. Turned power switch ON. (Stop mode)
4. Put disc (YEDS-18) in and press the 

( button.

5. Press the 

P button. (Tracking servo ON)

6. Adjust RV101 so that the oscilloscope waveform is as shown in

the figure below (eye pattern).
A good eye pattern means that the diamond shape (≈) in the
center of the waveform can be clearly distinguished.

7. After adjustment, remove the lead wire connecd in step 2.

•

 

When observing the eye pattern, set the oscilloscope for AC
range and raise vertical sensitivity.

Adjustment Location : BD board (see page 16)

Procedure :
1. Connect oscilloscope to test point TP (FEO) on BD board.
2. Connect between test point TP (FOK) and TP (GND) by lead

wire.

3. Turned Power switch on.

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

1.3 

±

 0.3 Vp-p

+
–

BD board

TP (FEO)
TP (VC)

oscilloscope

+
–

BD board

TP (RF)
TP (VC)

oscilloscope

(DC range)

FE1

D1

CV1: SW Tracking Adjustmnet

T1: SW Tracking Adjustment

RV41:
AM Tuned Level
Adjustment

CV2:
SW OSC voltage
Adjustment

T2:
SW OSC voltage
Adjustment

RV42:
FM Tuned Level
Adjustment

– 16 –

6. After check, remove the lead wire connected in step 2.

•

Try to measure several times to make sure that the ratio
of A : B or B : A is more than 10 : 7.

•

Take sweep time as long as possible and light up the
brightness to obtain best waveform.

Adjustment Location : BD board (see page 16)

+
–

BD board

TP (RF)
TP (VC)

oscilloscope

Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and press the 

( button.

4. Confirm that oscilloscope waveform is clear and check RF sig-

nal level is correct or not.

Clear RF signal waveform means that the shape “≈” can be
clearly distinguished at the center of the waveform.

•

 

Adjustment Location : BD board (see page 16)

+
–

BD board

TP (TEO)
TP (VC)

oscilloscope

Procedure :
1. Ground MAIN board IC101 (pin (£) with the lead wire.
2. Connect oscilloscope to test point TP (TEO) on BD board.
3. Turned Power switch on.
4. Put disc (YEDS-18) in and press the 

( button.

5. Confirm that the oscilloscope waveform is symmetrical on the

top and bottom in relation to 0 Vdc, and check this level.

specified level :

•

 —————— 

×

 100 = less than ± 7%

•

 A+B= 300 ± 100 mVp-p

6. Remove the lead wire connected in step 1.

This gain has a margin, so even if it is slightly off. There is no prob-
lem.
Therefore, do not perform, this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.

[BD BOARD] – Side B –

A-B

2 (A + B)

RF

FOK

RV101

IC101

IC102

TE1

FE1

FEO

RV103

TEO

VC

RV102

PCK

GND

IC104

symmetry

within 2.4 ± 0.7 Vp-p

4. Put disc (YEDS-18) in and turned Power switch on again and

actuate the focus search.  (actuate the focus search when disc
table is moving in and out.)

5. Check the oscilloscope waveform (S-curve) is symmetrical be-

tween A and B. And confirm peak to peak level within 2.4 ± 0.7
Vp-p.

•

 

B

A

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

level:
1.3 

±

 0.3Vp-p

level: 300 ± 100 mVp-p

0 V

A

B

•